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Topic: Air bladder seal tolerances (Read 683 times) previous topic - next topic

Air bladder seal tolerances

Question, the air bladder that is on our drivers side bedroom slide has been leaking apparently for a while. Our super RV tech and I have cleaned the underside of the seal and removed a small twig, a few more fir and pine needles, a piece of black electrical tape and gritty grime. In the process of doing this, we noticed that between the side of the slide and the middle of the slide there was about 1/4 inch difference, perhaps a bit less.  How much tolerance does this bladder seal
have?
My concern is that it will continue to seap water in.  Do we need to have the bladder replaced and if so, is Mot the best place to go?
Lynn and Linda Day and Harry the pug
RIP: Tank 01-2008 to 03-2020
2012 Nimbus 42' build 6555
ISX12-500hp
2015 Jeep Grand Cherokee
MC# 17723

Re: Air bladder seal tolerances

Reply #1 –
Before you go to deep into the rabbit hole... try adding air pressure (add gauge first) check to see what it is set at..New one is able to be set up to 16psi I believe.. see if that fills it in.. if not, Might need to adjust the slide (not sure if you can or not).

After I had my bladder in the bedroom replaced it would do some weird stuff.. Sometimes close off and sometimes not... but would always close off after I drove... I have pics and video .. no one could explain it.. now it works perfectly..

Re: Air bladder seal tolerances

Reply #3 –
I just recently had a new bladder installed. The new one is considbly stiffer than the old one. There was slight irregular bump on the slide, where the side of the slide joins the roof section
 I sanded it, lightly and it looked pretty good. In a heavy rain it leaked again.
I installed a pressure gauge and increased the pressure to about 18 lbs. Yeah no more leaks.
I am hoping that the stiffer bladder lasts even longer than the original..The bladder has about one half an inch the way mine is adjusted.
Safe Travels
Dave
2001 U320 40ft
Build #5867
2003 Tracker
VE7DOD

Re: Air bladder seal tolerances

Reply #4 –
Keep in mind that if you put to much pressure in the bladder it will crush the fiberglass.. if you do turn it up above what's recommended keep an eye on it before it destroys the shell.. so a gauge is a good start

Re: Air bladder seal tolerances

Reply #5 –
Thanks, I think we will make a trip to Nac and MOT for assistance in this process. Appreciate all the help in explaining what is going on. I would rather let them work it over than me or our RV tech accidentally mess it up. There may be more to meet the eye than an under deflated bladder.
Lynn and Linda Day and Harry the pug
RIP: Tank 01-2008 to 03-2020
2012 Nimbus 42' build 6555
ISX12-500hp
2015 Jeep Grand Cherokee
MC# 17723

Re: Air bladder seal tolerances

Reply #6 –
Quote from: DavidS –
Keep in mind that if you put to much pressure in the bladder it will crush the fiberglass.. if you do turn it up above what's recommended keep an eye on it before it destroys the shell.. so a gauge is a good start

David I think too much pressure will pop the bladder,  not the glass. The reason I think so is because HWH told me that the new bladders can take 16 lbs and the old ones about 12 lbs with no mention of glass damage at those numbers.

Re: Air bladder seal tolerances

Reply #7 –
Negative... without the gauge I had mine at 22lb psi.. cracked the slide fiberglass.. I had to patch mine up.. thanks for making me admit it .. lol

Re: Air bladder seal tolerances

Reply #9 –
Help me to understand something, once the bladder fills with air and seals, does anything check to see if it needs an occasional tweak to stay at the same pressure? Why I ask, is if the bladder fills up on a warm day, then temp drops down cold ( as it can do here in Texas)the air in the bladder shrinks a bit. Does anything trigger the little compressor to inflate or is everything pretty much one way only. X AMT of air inflates the bladder and that is it.
Lynn and Linda Day and Harry the pug
RIP: Tank 01-2008 to 03-2020
2012 Nimbus 42' build 6555
ISX12-500hp
2015 Jeep Grand Cherokee
MC# 17723

Re: Air bladder seal tolerances

Reply #10 –
From what I understand  the pressure stays the same continuous.  If  the hwh air talk's pressure goes down the air compress comes on to buildup pressure.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Air bladder seal tolerances

Reply #11 –
The adjustable valve for the bladder allows the air pressure to remain constant at whatever it has been set at.
Are you sure the bladder is leaking and not the slide opening itself where the fiberglass edge isn't properly sealed?  Have you tried removing the inside trim on the slide and having someone spray water from the outside while looking for water intrusion from inside with a flashlight? I had a leak that went through the bottom wall to the floor and only appeared as a wet floor.

Re: Air bladder seal tolerances

Reply #12 –
Slide bladder inflation is maintained at all times.  If you develop a leak in a slide bladder, the aux compressor may not shut off.
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Air bladder seal tolerances

Reply #13 –
Thanks for the additional information. I have seen moisture seeping under the bladder edge. When I pressed on the bladder it seemed softer than when it originally filled about 12 hours prior. I have not heard the aux compressor going on except when I cycled the slides. So perhaps I may have a compressor malfunction or a malfunctioning sensor?
Lynn and Linda Day and Harry the pug
RIP: Tank 01-2008 to 03-2020
2012 Nimbus 42' build 6555
ISX12-500hp
2015 Jeep Grand Cherokee
MC# 17723

Re: Air bladder seal tolerances

Reply #14 –
Your pressure switch for the compressor could be bad.
Richard & Betty Bark & Keiko our Golden Doodle
2003 U320T 3820 PBDS
Build # 6215
MC # 16926
2016 Chevrolet Colorado 4X4 diesel
 

Re: Air bladder seal tolerances

Reply #15 –
There is a manifold for the slide bladder that has a regulator on it as well.
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320